Circuit failure detector, electric vehicle charging controller including same, and circuit failure detection method

Abstract

The present invention relates to a circuit failure detector comprising: an input terminal for receiving a detection signal having a first frequency from an interlock circuit; a correction circuit for correcting the voltage of the received detection signal; a first comparator comparing the corrected detection signal with a first reference voltage and outputting a high voltage signal or a low voltage signal; a second comparator inverting the corrected detection signal, comparing the inverted detection signal with a second reference voltage, and outputting the high voltage signal or the low voltage signal; a counting signal generator for generating a counting signal having a second frequency; a first coupler for coupling an output signal of the first comparator with the counting signal; a second coupler for coupling the output signal of the second comparator with the counting signal; and a controller for detecting a circuit failure on the basis of the output signal of the first coupler and the output signal of the second coupler.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. national stage application of International Patent Application No. PCT / KR2017 / 008545, filed Aug. 8, 2017, which claims the benefit under 35 U.S.C. § 119 of Korean Application No. 10-2016-0102391, filed Aug. 11, 2016, the disclosures of each of which are incorporated herein by reference in their entirety.TECHNICAL FIELD[0002]The present invention relates to a circuit failure detector, including an input terminal receiving a detection signal having a first frequency from an interlock circuit, a correction circuit correcting a voltage of the input detection signal, a first comparator outputting a high voltage signal or a low voltage signal by comparing the corrected detection signal with a first reference voltage, a second comparator inverting the corrected detection signal and outputting a high voltage signal or a low voltage signal by comparing the inverted detection signal with a second reference voltage, a co...

AI Technical Summary

Benefits of technology

The solution enables precise detection of circuit failures in electric vehicles, reducing repair costs and allowing for autonomous diagnosis without fuses, while maintaining system safety by opening a relay circuit when a failure is detected.

Problems solved by technology

However, the electric vehicle essentially requires a battery, that is, the supply source of energy, and the commercialization of the electric vehicle is delayed due to the light-weight / small size and short charging time of the battery.

However, in the process of the electric vehicle being charged or discharged in the charging station, various failure modes, such as a short, an open, a short circuit, a battery short and a ground (vehicle body) short, may occur.

In such a conventional failure mode processing method, however, there is inconvenience that a fuse must be replaced each time because the fuse is open when a failure mode occurs.

There is a problem in that a failure mode cannot be detected when an overcurrent does not flow to the extent that the fuse is suspended.

Furthermore, there is a disadvantage in that failure diagnosis cannot be performed although a failure occurs in a high-voltage interlock (HVIL) module itself.

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